So yeah finally saw it. Thought it was great, not just for the awesome sound and picture quality and not just for the added scenes either, but more that they overhauled the entire movie.
At first I thought this movie was just a re-render of the original at 1080p with added new scenes, but nearly the entire movie is different ( different angles, added detail, different lighting ), which made it feel a lot more like a proper feature film.
I especially loved Bahamut's face now getting smashed open after Cloud smashes him down and ofcourse the redone final battle with Sephiroth, blood ftw.

Also I don't get why this movie is ~pg-13 everywhere, here its rated 6+ >_>.